How I calculated taurine: According to Max's House, AAFCO recommends that cat food be supplemented with Taurine 0.50g/1000kCal.

Unlike humans, cats can synthesize Vitamin C, however a wild diet provides quite a bit. The small amount in this powder provides a bit of a boost to sick or nutritionally compromised cats.

How I calculated flaxseed: The innerwebs contain dozens of recommendations for flaxseed supplementation ranging from 1/2 tsp to 3 TBS for a human. I went with the low recommendation based on information in Health and Healing With Bee Products by Dr. C. Leigh Broadhurst, PhD. and scaled it down for cats. This amount is far less than what is recommended on sites that sell ground flaxseed, some of which recommend a tsp per day for a cat. Flaxseed can cause constipation in large amounts.